From 1f989af845df8009fb87d1ecd1b3fed922940142 Mon Sep 17 00:00:00 2001
From: Gregory Nutt <gnutt@nuttx.org>
Date: Sat, 12 Aug 2017 12:26:13 -0600
Subject: [PATCH] Update TODO list; SAMv7 XDMAC: Remove and unused global
 array.

---
 TODO                           | 18 ++++++++++++++++++
 arch/arm/src/samv7/sam_spi.c   |  4 ++++
 arch/arm/src/samv7/sam_xdmac.c |  9 ---------
 3 files changed, 22 insertions(+), 9 deletions(-)

diff --git a/TODO b/TODO
index b385ef24bd..e2c66cb3be 100644
--- a/TODO
+++ b/TODO
@@ -2134,6 +2134,24 @@ o Build system
                if you ever decide to control-C out of a make and see that the
                libapps.a file was deleted.
 
+               UPDATE:  This is a potential fix for the second problem in place
+               in apps/Application.mk.  That is include by most (but not all)
+               lower-level Makefiles.  This fix is:
+
+                  --- a/Application.mk
+                  +++ b/Application.mk
+                  @@ -70,6 +70,7 @@ VPATH =
+
+                  all: .built
+                  .PHONY: clean preconfig depend distclean
+                 +.PRECIOUS: $(BIN)
+
+                  $(AOBJS): %$(OBJEXT): %.S
+                         $(call ASSEMBLE, $<, $@)
+
+                It has not yet been confirmed that this fix totally eliminates
+                the issue.
+
 o Other drivers (drivers/)
   ^^^^^^^^^^^^^^^^^^^^^^^^
 
diff --git a/arch/arm/src/samv7/sam_spi.c b/arch/arm/src/samv7/sam_spi.c
index a1df892188..b2f5f8daea 100644
--- a/arch/arm/src/samv7/sam_spi.c
+++ b/arch/arm/src/samv7/sam_spi.c
@@ -1481,7 +1481,9 @@ static void spi_exchange(struct spi_dev_s *dev, const void *txbuffer,
 {
   struct sam_spics_s *spics = (struct sam_spics_s *)dev;
   struct sam_spidev_s *spi = spi_device(spics);
+#ifdef CONFIG_SAMV7_SPI_VARSELECT
   uint32_t pcs;
+#endif
   uint32_t data;
   uint16_t *rxptr16;
   uint16_t *txptr16;
@@ -1490,9 +1492,11 @@ static void spi_exchange(struct spi_dev_s *dev, const void *txbuffer,
 
   spiinfo("txbuffer=%p rxbuffer=%p nwords=%d\n", txbuffer, rxbuffer, nwords);
 
+#ifdef CONFIG_SAMV7_SPI_VARSELECT
   /* Set up PCS bits */
 
   pcs = spi_cs2pcs(spics) << SPI_TDR_PCS_SHIFT;
+#endif
 
   /* Set up working pointers */
 
diff --git a/arch/arm/src/samv7/sam_xdmac.c b/arch/arm/src/samv7/sam_xdmac.c
index b47617cafe..cae694a68e 100644
--- a/arch/arm/src/samv7/sam_xdmac.c
+++ b/arch/arm/src/samv7/sam_xdmac.c
@@ -134,15 +134,6 @@ struct sam_xdmac_s
  * Private Data
  ****************************************************************************/
 
-/* Channel Control (CC) Register field lookups */
-
-static const uint32_t g_chanwidth[3] =
-{
-  XDMACH_CC_DWIDTH_BYTE,
-  XDMACH_CC_DWIDTH_HWORD,
-  XDMACH_CC_DWIDTH_WORD,
-};
-
 /* These tables map peripheral IDs to channels.  A lookup is performed
  * before each DMA transfer in order to map the peripheral IDs to the
  * correct channel.  This must be done because the channel can change with